Description
Within this use case you learn about the difference between intrinsic
linear size and apparent angular size, a difference that is frequently
at the center of astronomical problems. Star clusters are the objects
used to illustrate this difference. You also learn some basic facts
about star clusters, whose distribution in space has helped us to
understand the structure of our Milky Way. Thanks to Aladin, you will
be able to explore their distribution on the sky on your own.
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